<!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <title>Gooey倒计时</title>

    <style>
        *, *::before, *::after {
            margin: 0;
            padding: 0;
            box-sizing: inherit;
        }
        body {
            display: -webkit-box;
            display: -ms-flexbox;
            display: flex;
            box-sizing: border-box;
            background-color: hsl(210, 5%, 12%);
        }
        svg {
            margin: auto;
            width: 100vmin;
        }
        g > text {
            text-anchor: middle;
            font-size: 400px;
            font-family: Overpass Mono, monospace;
            fill: hsl(210, 100%, 75%);
            opacity: 0;
            -webkit-animation-name: opac;
            animation-name: opac;
            -webkit-animation-duration: 11s;
            animation-duration: 11s;
            -webkit-animation-timing-function: linear;
            animation-timing-function: linear;
            -webkit-animation-iteration-count: infinite;
            animation-iteration-count: infinite;
        }
        g > text:nth-child(1) { -webkit-animation-delay: 0s; animation-delay: 0s; }
        g > text:nth-child(2) { -webkit-animation-delay: 1s; animation-delay: 1s; }
        g > text:nth-child(3) { -webkit-animation-delay: 2s; animation-delay: 2s; }
        g > text:nth-child(4) { -webkit-animation-delay: 3s; animation-delay: 3s; }
        g > text:nth-child(5) { -webkit-animation-delay: 4s; animation-delay: 4s; }
        g > text:nth-child(6) { -webkit-animation-delay: 5s; animation-delay: 5s; }
        g > text:nth-child(7) { -webkit-animation-delay: 6s; animation-delay: 6s; }
        g > text:nth-child(8) { -webkit-animation-delay: 7s; animation-delay: 7s; }
        g > text:nth-child(9) { -webkit-animation-delay: 8s; animation-delay: 8s; }
        g > text:nth-child(10) { -webkit-animation-delay: 9s; animation-delay: 9s; }
        g > text:nth-child(11) { -webkit-animation-delay: 10s; animation-delay: 10s; }

        @-webkit-keyframes opac {
            0% { opacity: 0; }
            7.5% { opacity: 1; }
            10% { opacity: 1; }
            15% { opacity: 0; }
            100% { opacity: 0; }
        }

        @keyframes opac {
            0% { opacity: 0; }
            7.5% { opacity: 1; }
            10% { opacity: 1; }
            15% { opacity: 0; }
            100% { opacity: 0; }
        }
    </style>
</head>
<body>

<svg viewBox="-500 -500 1000 1000" width="100%" height="100%" preserveAspectRatio="xMidYMin slice">
    <defs>
        <filter id="goo">
            <feGaussianBlur in="SourceGraphic" stdDeviation="10" result="blur"></feGaussianBlur>
            <feColorMatrix in="blur" mode="matrix" values="1 0 0 0 0  0 1 0 0 0  0 0 1 0 0  0 0 0 20 -5" result="goo"></feColorMatrix>
            <feComposite in="SourceGraphic" in2="goo" operator="atop"></feComposite>
        </filter>
    </defs>
    <circle fill="hsla(0, 100%, 50%, 0.25)" cx="0" cy="0" r="300"></circle>
    <g filter="url(#goo)">
        <text x="0" y="150">10</text>
        <text x="0" y="150">9</text>
        <text x="0" y="150">8</text>
        <text x="0" y="150">7</text>
        <text x="0" y="150">6</text>
        <text x="0" y="150">5</text>
        <text x="0" y="150">4</text>
        <text x="0" y="150">3</text>
        <text x="0" y="150">2</text>
        <text x="0" y="150">1</text>
        <text x="0" y="150">GO</text>
    </g>
</svg>

</body>
</html>
